Defecting the ship’s hull is an inspection of the ship’s hull, interrelated mechanisms, carrying out the tests required for this, measurements, as a result of which the ship is recognized as suitable or unfit for further use, and also determines the amount of repair work.
How is such an inspection of the hull?
- The whole structure is fixed on a special platform, a ship-raising structure (they are called slips or dock-caissons).
- From the outside of the skin, the structure is divided into sections, the frames are numbered (the elements that make up the skeleton on which the sheathing is mounted). The control sections are intended – the places where the thickness of the skin will be measured. As a rule, the most weakened areas are selected. They can be from four to six, depending on the size of the vessel.
- The actual measurements are carried out with the help of ultrasonic devices and a visual inspection, the deformation characteristics are determined, that is, the depth of dents, the degree of wear of construction details, etc. The survey is carried out in a certain order: from the bow to the stern, from the keel (lower beam, base) to the highest point. So the chance to miss any damage is significantly reduced.
- Identified characteristics are compared with established standards.
- Documentation is being formed.
Composition of documents on the results of flaw detection
- Measurement tables, which then must be saved. On the basis of them is determined by the technical condition of a site examined.
- A drawing with the image of the outer skin (“Stretching the outer skin”), on which the symbols indicate its defects: damage, dents, worn parts, the need to replace the skin element.
- Defects Act – a consolidated document, which is signed by the commission that examined the structure and the specialist of the Russian River Register (federal autonomous institution for the classification of vessels).
- assessment of the current state of the hull;
- estimated scope of repair;
- a perspective description of the ship after repair.
Damage that can be detected upon inspection
- The wear of any item, that is, the part has served its time.
- Deformations due to collision with another vessel, ice or mechanical impact of a load.
- Cracks and breaks in the casing.
- Other, that is:
- leaking holes;
- wear of weld seams of metal plating, etc.
The degree of danger of a defect is determined primarily by the type and purpose of the vessel.
All our specialists are qualified professionals, and the devices have been tested by a state institution, so LLC “VIKAR” rightfully guarantees customers quality work.